class_docstr: Unit tests for the ``rydberg_interaction`` function.
docstr: Test that the generated coefficients are correct.
docstr_tok: ["Test","that","the","generated","coefficients","are","correct","."]
code: def test_coeffs(self):
      """Test that the generated coefficients are correct."""
      coords = [[0, 0], [0, 1], [1, 0]]
      # factor (2 * np.pi) to convert between angular and standard frequency
      Hd = rydberg_interaction(
          coords, interaction_coeff=1 / (2 * np.pi)
      )
      assert Hd.coeffs == [1, 1, 1 / np.sqrt(2) ** 6]
  
imports: import numpy
  import pytest
  import pennylane
  from pennylane.pulse import rydberg_interaction, rydberg_drive
  from pennylane.pulse.hardware_hamiltonian import HardwareHamiltonian, HardwarePulse, AmplitudeAndPhase
  from pennylane.wires import Wires
  from pennylane.pulse.rydberg import RydbergSettings
label_desc: Use image node_id 4 for calling the TestRydbergInteraction obj's underlying member method code with example usage: obj.test_coeffs() without return types